

package cn.shengchao.page;

import cn.shengchao.base.utils.HttpKit;
import org.springframework.core.MethodParameter;
import org.springframework.http.MediaType;
import org.springframework.http.converter.HttpMessageConverter;
import org.springframework.http.server.ServerHttpRequest;
import org.springframework.http.server.ServerHttpResponse;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.servlet.mvc.method.annotation.ResponseBodyAdvice;
import top.continew.starter.extension.crud.model.resp.PageResp;

import java.util.List;

@ControllerAdvice
public class PageResponse implements ResponseBodyAdvice<Object> {

    @Override
    public boolean supports(MethodParameter returnType, Class<? extends HttpMessageConverter<?>> converterType) {
        return true;
    }

    @Override
    public Object beforeBodyWrite(Object body,
                                  MethodParameter returnType,
                                  MediaType selectedContentType,
                                  Class<? extends HttpMessageConverter<?>> selectedConverterType,
                                  ServerHttpRequest request,
                                  ServerHttpResponse response) {
        Object total = HttpKit.getRequest().getAttribute("total");
        if (total != null && body instanceof List) {
            body = new PageResp<>((List)body, (Long)total);
        }
        return body;
    }
}
